Vibration-transmission mechanism



Feb. 4, 1930. v. HIMMER VIBRATION TRANSMISSION MECHANISM med Nov. 11. 1926 INVENTOR wme BY m j 4% A TTURNEYS m m V Patented Feb( 4, 1930 I especially applicable An object of the invention is to provide'a' QUNITE IS sT VIT'ALIS HIM'MER, or mouu'rniu axnspunwf EnsE vrnnA'riou-rneusmisszou MEorIAuisM' Application filed November 11, 19265 se'r'iai No.'-14"?,658.j

vibration transmission mechanisms, and has particular reference to an electrically modulated device for converting electricalim pulses into audible sounds, the device being for use with loudspeak ers, telephone receivers and like instruments.

I mechanism of practical, reliable and sturdy ture to a diaphragm, may 'be'connected'diconstruction, which will efiectively convert the electrical modulations into mechanlcal vibrations of maxlmum strength.

1 In accordance with the above 'objectjthe armature of an electromagnetic device s so po- V sitioned with respect toits modulation coil *that the vibration transmission element, utilized' to transmit the vibratlons of sa darmarectly to said armature.

A further object is to so mount the transmission element that the same-may be used as the sole support for a vibratory diaphragm 1 without placing undue stress,occas1oned by of Figure 3;

scription, when accompanying the weight of said diaphragm, upon thepointof connection ofsaid element withitsarmature.

'The above and otherobjects will appear more clearly from the following detailed de taken in connection with the entive idea.

' Figure 3 1s a front elevation ofthe mechanism with the casing shown in section;

Figure 4: is a top plan view; and

t Figure 5 is anend elevation showing de y nerj end of wh ch is secured directly to the tails of the armature mounting.

Referring more particularly to the draw- 'ing the -transmission mechanism is shown as consisting ofa casing 6 made of any desirable drawing, which, illustrates a V as desired.- One; end "of the-easing is open This invention relates to improvements infmaterialand which i's rectangularorcircular,

and has mounted therein a' disk or a plate '7 I 'which'{ is preferably of wood, "and which is r utilized'as a means for attaching the unit to a standard or other be1ng of wood in order readily prevent the transmission of vibra-' tions to the standard upon which thet-unit is y Y i I v o5 v mounted.

' I Suitably secured: to the inner face-olthe disk 7 is amounting -plate'8, which is prefers. ably a casting: andwwhich is provided at one support, said disk to absorb and more end with a'boss 9'." Interposed'between the;

mounting: plate 8' andlthe ends of the -mag-. net 10 are theopposed polepieceslll, said theends of the magnet 10 and havingsc-rews 13 extending therethrough and into the pole attachedzto.-,.the mounting plate 8and pro- 'videdwith terminal,posts: 18 for connection toa suitable circuitr The modulation coil,

14: is'in the form'o-i a spool having a central" opening 19 therein through which the free end -'magnet and p'oleipieces being secured tov ether by the supportingbarfll2 bridging have.mounted"therebetween the of the armature 20"exten'ds. Adjustably secured to the pole pieces l'l-onone side of the coil-l ilare auxiliary positive and negative pole pieces 21*and'22, respectively, while arranged on'the opposite side of said coil and also securedto the polepieces 11' are the positive and negative; auxiliary pole pieces.

23 and 24, said polepieces having'th e ability, when the coilil i isenergized, to flex the armatureI20 inaorder to impart a vibratory movement to the transmission rod 25, the in-o V 8 Thuswhen thearmature 20 is flexedby the energization of'the coil 14 the vibrations of the armature will be transmitted directly to the rod 25 and from thence to the diaphragm 26 partially illustrated in Figure 2 and being of any desirable type. The entire weight of this diaphragm is carried by the rod 25 and this is made possible by the provision of a supporting means for said rod 25 which will relieve any strain occasioned by the weight of the diaphragm upon the point of connection of the inner end of the rod with the armature 20. Thissupporting means is in the form of a flexible element 27 having one end secured to the supporting bar 12 and its other end attached to the rod 25 intermediate its ends. The element 27 is made flexible in order that the same will not hinder the free vibration of the rod 25, but at the same time it supports said rod sufiiciently to permit of the diaphragm being mounted upon its outer extremity and prevent any undue lateral movement of the rod which may be otherwise occasioned by said supporting bar and atits other end to an intermediate portion of said rod to support the latter.

In testimony whereof I have aflixed my signature. I

V VITALIS HIMMER.

the flexing of the armature 20 so that the vibrations of the rod will, for all practical purposes, be in directions longitudinally thereof. 7

With the free end of the armature 20 extending through the coil 14 and the rod 25 connected to an intermediate part ofthe armature, the other extremity of the latter is secured to the mounting plate in such manner that the first named extremity may be mechanically and magneticallybalanced between the pole pieces and maintained in such position. For this purpose the boss 9 is provided with the projections 28 arranged in transverse alignment with respect to the armature 20 and upon which the fixed end of 7 said armature rests.

On the opposite side of the armature from that engaged by the projection 28 and directly opposed to the latter, said armature also has engaged therewith the plate 29 which is in turn contacted 1 by an arcuate leaf spring 30. A screw or other adjusting device 31- is extended through the spring plate, armature and into the boss 9 so that by turning the screw 31 a greater or lesser degree of pressure may be exerted upon the armature. In order to adjust the armature a set screw 32 is extended through the disk 7 in screwthreaded relation with the boss 9 with the inner end of the screw contacting the fixed extremity of the armature 20 so that by turning the screwand also utilizing the screw 31, if necessary, a slight adjustment of the free end'of the armature ance the other end thereof in may be had.

What is claimed is:

In a vibration transmission mechanism, a flexible vibratory armature, an electromagnetic device, means at one end of said armature to magnetically and mechanically balthe magnetic field of said device, a vibration transmission 

